Started at the puerto de Navacerrada, summited Bola del Mundo and kept going to the top of nearby Cerro de Valdemartín. Then it was just a matter of going back the same way.
A wonderful sunny day with snow-covered summits

We drove from Pozuelo (Madrid) starting at 15:05, ascended on the normal route from Puerto de Navacerrada. The trail was always snowed but the weather was sunny and calm. The ascent was quick, when we reached the top we were eating something. We'd decided to follow to Valdemartín or Maliciosa but we couldn't because it was late and I'd forgotten my headlamp at home. So we descended to Puerto de Navacerrada and drove back to Madrid.

In an orange (important) weather risk because of 115 Km/h winds Nadie and me started its ascent from Puerto de Navacerrada without any pole or crampons. And 1h 15 min. after buying a warm cap at Venta Arias (I left it at home), we reached Bola del Mundo summit. The guts were not as strong as AEMET forecasted but we had some problems trying to avoid putting our boots on the ice. There was few people on the mountain and we enjoyed the excursion though the freezing conditions (Tmin= -3ºC). I must give thanks to Nadie because of carrying the only backpack that we had.

I could have ascended Bola del Mundo 30 times in life and I can't remember the first time though it should have been in the early 80s.